Maintenance
14.1 Replacing components of the S7-1500R/H redundant system
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
445
• In STEP 7 in the diagnostic status (Online & diagnostics) of the S7-1500R/H system:
Check the system state in the diagnostic status:
– Pairing: "Paired" is shown in the "Pairing state" field.
– No pairing: "No pairing" is displayed in the "Pairing status" field.
Figure 14-1 "Paired" diagnostics state
• In STEP 7 in the diagnostics buffer (Online & diagnostics): Check the entries on pairing.
Procedure
To start the pairing, for example when redundancy connections are interrupted, follow these
steps:
1. Set the mode selector for the backup CPU to STOP.
2. S7-1500R: Repair the PROFINET cables in the PROFINET ring. Insert the PROFINET cables into
the R-CPU interfaces.
S7-1500H: Repair the fiber-optic cables and synchronization modules. Insert the fiber-optic
cables into the synchronization modules.
3. Check for successful pairing of the redundant system. Please note the information in
"Checking pairing state" above.
4. Set the mode selector for the backup CPU to RUN.
Result
The S7-1500R/H redundant system switches to the RUN-Redundant system state.
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